# 3.1. Unable to open/launch ReVanced YouTube / ReVanced crashing

Probably one of the following:

• split APK is used to patch
  • Patch again using the full APK
• non-recommended patches/version
  • Patch again with the default/recommended patches/version
  • Refer to section 2.11 (What patch should I select?)
• GmsCore not installed
  • Install it here
• You exited ReVanced manager when patching
  • Don't do that. Repatch again.
• There were errors during patching
  • Look at the patching log for failed
  • It should be at the first word of the line
  • if so, look at the patch not applied guide